What does error code E6 mean on a Mitsubishi Electric mini-split?

Indoor/outdoor communication error. The indoor and outdoor units aren't communicating.

Can I fix Mitsubishi Electric code E6 myself?

Start with these safe checks: Check that the breaker and outdoor disconnect for the system are on. Turn the system's breaker off for a few minutes and back on to reset once. Interconnecting wiring carries line voltage. If it returns, call an HVAC technician.

When should I call a technician for code E6?

Interconnecting wiring carries line voltage. If it returns, call an HVAC technician. Unplug it or switch the breaker off before you remove any panel. Don't test or replace wiring, control boards, heating elements or motors under power. If you see scorching, smell burning, or the breaker trips again, leave it off and call a qualified appliance technician or electrician.

Mitsubishi Electric Mini-Split Error Code E6 / E7 / 3 blinks:…

What E6 means

The indoor and outdoor units aren't communicating.

Also shown as: E7, 3 blinks, depending on the model.

Likely causes

Outdoor unit power off or breaker tripped
Wiring between units
Control board fault

Safe first checks

Check that the breaker and outdoor disconnect for the system are on.
Turn the system's breaker off for a few minutes and back on to reset once.

When to stop

Interconnecting wiring carries line voltage. If it returns, call an HVAC technician.

Checked against: Mitsubishi Electric, Mr. Slim indoor/outdoor unit malfunction-diagnosis check codes (2024-11-18). Codes can differ by model and year, so confirm with your owner's manual.